cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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machvec.c (2855B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * arch/sh/kernel/machvec.c
      4 *
      5 * The SuperH machine vector setup handlers, yanked from setup.c
      6 *
      7 *  Copyright (C) 1999  Niibe Yutaka
      8 *  Copyright (C) 2002 - 2007 Paul Mundt
      9 */
     10#include <linux/init.h>
     11#include <linux/string.h>
     12#include <asm/machvec.h>
     13#include <asm/sections.h>
     14#include <asm/addrspace.h>
     15#include <asm/setup.h>
     16#include <asm/io.h>
     17#include <asm/irq.h>
     18#include <asm/processor.h>
     19
     20#define MV_NAME_SIZE 32
     21
     22#define for_each_mv(mv) \
     23	for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
     24	     (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
     25	     (mv)++)
     26
     27static struct sh_machine_vector * __init get_mv_byname(const char *name)
     28{
     29	struct sh_machine_vector *mv;
     30
     31	for_each_mv(mv)
     32		if (strcasecmp(name, mv->mv_name) == 0)
     33			return mv;
     34
     35	return NULL;
     36}
     37
     38static unsigned int __initdata machvec_selected;
     39
     40static int __init early_parse_mv(char *from)
     41{
     42	char mv_name[MV_NAME_SIZE] = "";
     43	char *mv_end;
     44	char *mv_comma;
     45	int mv_len;
     46	struct sh_machine_vector *mvp;
     47
     48	mv_end = strchr(from, ' ');
     49	if (mv_end == NULL)
     50		mv_end = from + strlen(from);
     51
     52	mv_comma = strchr(from, ',');
     53	mv_len = mv_end - from;
     54	if (mv_len > (MV_NAME_SIZE-1))
     55		mv_len = MV_NAME_SIZE-1;
     56	memcpy(mv_name, from, mv_len);
     57	mv_name[mv_len] = '\0';
     58	from = mv_end;
     59
     60	machvec_selected = 1;
     61
     62	/* Boot with the generic vector */
     63	if (strcmp(mv_name, "generic") == 0)
     64		return 0;
     65
     66	mvp = get_mv_byname(mv_name);
     67	if (unlikely(!mvp)) {
     68		pr_info("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
     69		for_each_mv(mvp)
     70			pr_cont("'%s', ", mvp->mv_name);
     71		pr_cont("\n\n");
     72		panic("Failed to select machvec '%s' -- halting.\n",
     73		      mv_name);
     74	} else
     75		sh_mv = *mvp;
     76
     77	return 0;
     78}
     79early_param("sh_mv", early_parse_mv);
     80
     81void __init sh_mv_setup(void)
     82{
     83	/*
     84	 * Only overload the machvec if one hasn't been selected on
     85	 * the command line with sh_mv=
     86	 */
     87	if (!machvec_selected) {
     88		unsigned long machvec_size;
     89
     90		machvec_size = ((unsigned long)&__machvec_end -
     91				(unsigned long)&__machvec_start);
     92
     93		/*
     94		 * Sanity check for machvec section alignment. Ensure
     95		 * __initmv hasn't been misused.
     96		 */
     97		if (machvec_size % sizeof(struct sh_machine_vector))
     98			panic("machvec misaligned, invalid __initmv use?");
     99
    100		/*
    101		 * If the machvec hasn't been preselected, use the first
    102		 * vector (usually the only one) from .machvec.init.
    103		 */
    104		if (machvec_size >= sizeof(struct sh_machine_vector))
    105			sh_mv = *(struct sh_machine_vector *)&__machvec_start;
    106	}
    107
    108	pr_notice("Booting machvec: %s\n", get_system_type());
    109
    110	/*
    111	 * Manually walk the vec, fill in anything that the board hasn't yet
    112	 * by hand, wrapping to the generic implementation.
    113	 */
    114#define mv_set(elem) do { \
    115	if (!sh_mv.mv_##elem) \
    116		sh_mv.mv_##elem = generic_##elem; \
    117} while (0)
    118
    119	mv_set(irq_demux);
    120	mv_set(mode_pins);
    121	mv_set(mem_init);
    122}